linux-toradex.git/drivers/usb/renesas_usbhs/mod.c, branch v4.4.61 Linux kernel for Apalis and Colibri modules usb: renesas_usbhs: fix clearing the {BRDY,BEMP}STS condition 2016-09-24T08:07:39+00:00 Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com 2016-08-29T09:00:38+00:00 59bc6b85d6a407aae0bb7135ea4da2aa00161f88 commit 519d8bd4b5d3d82c413eac5bb42b106bb4b9ec15 upstream. The previous driver is possible to stop the transfer wrongly. For example: 1) An interrupt happens, but not BRDY interruption. 2) Read INTSTS0. And than state->intsts0 is not set to BRDY. 3) BRDY is set to 1 here. 4) Read BRDYSTS. 5) Clear the BRDYSTS. And then. the BRDY is cleared wrongly. Remarks: - The INTSTS0.BRDY is read only. - If any bits of BRDYSTS are set to 1, the BRDY is set to 1. - If BRDYSTS is 0, the BRDY is set to 0. So, this patch adds condition to avoid such situation. (And about NRDYSTS, this is not used for now. But, avoiding any side effects, this patch doesn't touch it.) Fixes: d5c6a1e024dd ("usb: renesas_usbhs: fixup interrupt status clear method") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 519d8bd4b5d3d82c413eac5bb42b106bb4b9ec15 upstream.

The previous driver is possible to stop the transfer wrongly.
For example:
 1) An interrupt happens, but not BRDY interruption.
 2) Read INTSTS0. And than state->intsts0 is not set to BRDY.
 3) BRDY is set to 1 here.
 4) Read BRDYSTS.
 5) Clear the BRDYSTS. And then. the BRDY is cleared wrongly.

Remarks:
 - The INTSTS0.BRDY is read only.
  - If any bits of BRDYSTS are set to 1, the BRDY is set to 1.
  - If BRDYSTS is 0, the BRDY is set to 0.

So, this patch adds condition to avoid such situation. (And about
NRDYSTS, this is not used for now. But, avoiding any side effects,
this patch doesn't touch it.)

Fixes: d5c6a1e024dd ("usb: renesas_usbhs: fixup interrupt status clear method")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: renesas_usbhs: avoid uninitialized variable use 2015-05-22T13:52:16+00:00 Arnd Bergmann arnd@arndb.de 2015-05-22T11:06:35+00:00 672bfdaa310004368a0d493478e2a40f2f2f914f After the renesas_usbhs driver is enabled in ARM multi_v7_defconfig, we now get a new warning: renesas_usbhs/mod.c: In function 'usbhs_interrupt': renesas_usbhs/mod.c:246:7: warning: 'intenb1' may be used uninitialized in this function [-Wmaybe-uninitialized] gcc correctly points to a problem here, for the case that the device is in host mode, we use the intenb1 variable without having assigned it first. The state->intsts1 has a similar problem, but gcc cannot know that. This avoids the problem by initializing both sides of the comparison to zero when we don't read them from the respective registers. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 88a25e02f3 ("usb: renesas_usbhs: Add access control for INTSTS1 and INTENB1 register") Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
After the renesas_usbhs driver is enabled in ARM multi_v7_defconfig,
we now get a new warning:

renesas_usbhs/mod.c: In function 'usbhs_interrupt':
renesas_usbhs/mod.c:246:7: warning: 'intenb1' may be used uninitialized in this function [-Wmaybe-uninitialized]

gcc correctly points to a problem here, for the case that the
device is in host mode, we use the intenb1 variable without
having assigned it first. The state->intsts1 has a similar
problem, but gcc cannot know that.

This avoids the problem by initializing both sides of the
comparison to zero when we don't read them from the respective
registers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 88a25e02f3 ("usb: renesas_usbhs: Add access control for INTSTS1 and INTENB1 register")
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: renesas_usbhs: Add access control for INTSTS1 and INTENB1 register 2015-05-14T14:56:09+00:00 Nobuhiro Iwamatsu nobuhiro.iwamatsu.yj@renesas.com 2015-01-09T00:28:41+00:00 88a25e02f35e56a6686d94fa334b7f00e9b72623 INTSTS1 and INTENB1 register of renesas_usbhs can access only Host mode. This adds process of accessing INTSTS1 and INTENB1 only when renesas_usbhs is Host mode. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
INTSTS1 and INTENB1 register of renesas_usbhs can access only Host mode.
This adds process of accessing INTSTS1 and INTENB1 only when renesas_usbhs
is Host mode.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: renesas_usbhs: protect mod->irq_{bemp,brdy}sts by spin lock 2014-09-03T14:15:57+00:00 Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com 2014-08-22T11:14:00+00:00 c4d8199ba1a7aa390b06db23f4532e2c1875aefb This patch protects the mod->irq_bempsts and mod->irq_brdysts by spin lock in the usbhs_status_get_each_irq() because other functions will write them during spin lock. Otherwise, the driver will clears the BRDYSTS and/or BEMPSTS wrongly, and then, the transaction will not finish. Also since the driver should use the INTSTS0 and BRDYSTS and BEMPSTS as the same timing, the patch protects them. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
This patch protects the mod->irq_bempsts and mod->irq_brdysts by
spin lock in the usbhs_status_get_each_irq() because other functions
will write them during spin lock. Otherwise, the driver will clears
the BRDYSTS and/or BEMPSTS wrongly, and then, the transaction will not
finish.
Also since the driver should use the INTSTS0 and BRDYSTS and BEMPSTS
as the same timing, the patch protects them.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Merge tag 'gadget-for-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next 2012-11-12T01:31:53+00:00 Greg Kroah-Hartman gregkh@linuxfoundation.org 2012-11-12T01:31:53+00:00 7fd94beecaff19b346efbf6b77288ab4b0b42dbd USB gadget patches from Felipe: "usb: gadget: patches for v3.8 renesas_usbhs implements ->pullup() method, switches over to devm_request_irq(), adds support for DMA Engine and got a few miscelaneous cleanups. The NCM gadget got an endianness fix and the Ethernet gadget a frame size fix. We're finally removing the g_file_storage gadget and sticking to g_mass_storage and the new tcm_usb_gadget gadgets since that was a huge duplicaton of effort anyway. While removing g_file_storage, we also had to fix a bunch of defconfigs which were still pointing to the old gadget. There's a big series getting us closer to being able to introduce our configfs interface. The series converts functions into loadable modules which will, eventually, be registered to the configfs interface. Other than that there's the usual typo fixes and miscelaneous cleanups all over the place." 
USB gadget patches from Felipe:
"usb: gadget: patches for v3.8

renesas_usbhs implements ->pullup() method, switches over
to devm_request_irq(), adds support for DMA Engine and
got a few miscelaneous cleanups.

The NCM gadget got an endianness fix and the Ethernet
gadget a frame size fix.

We're finally removing the g_file_storage gadget and
sticking to g_mass_storage and the new tcm_usb_gadget
gadgets since that was a huge duplicaton of effort anyway.

While removing g_file_storage, we also had to fix a bunch
of defconfigs which were still pointing to the old gadget.

There's a big series getting us closer to being able to
introduce our configfs interface. The series converts
functions into loadable modules which will, eventually,
be registered to the configfs interface.

Other than that there's the usual typo fixes and miscelaneous
cleanups all over the place."
usb: renesas_usbhs: use devm_request_irq() 2012-10-31T12:50:16+00:00 Kuninori Morimoto kuninori.morimoto.gx@renesas.com 2012-10-29T07:44:41+00:00 797b4e145cfaaa787d91ab692b0956f799e77b7a This patch uses devm_request_irq() instead of request_irq(), and removed free_irq() from driver Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
This patch uses devm_request_irq() instead of request_irq(),
and removed free_irq() from driver

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: renesas_usbhs: fixup interrupt status clear method 2012-10-16T09:47:40+00:00 Kuninori Morimoto kuninori.morimoto.gx@renesas.com 2012-10-12T04:49:38+00:00 d5c6a1e024dd5acd6ad2e1a6eb6a2fd5c15c50f1 When interrupt happened, renesas_usbhs driver gets irq status by usbhs_status_get_each_irq(), and cleared all status by using 0. But, this method is incorrect, since extra interrupt might occur between them. This patch cleared corresponding bits only Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
When interrupt happened, renesas_usbhs driver gets irq status
by usbhs_status_get_each_irq(), and cleared all status by using 0.
But, this method is incorrect,
since extra interrupt might occur between them.
This patch cleared corresponding bits only

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: renesas_usbhs: modify the irq handler for sharing irq 2012-09-05T23:52:08+00:00 Shimoda, Yoshihiro yoshihiro.shimoda.uh@renesas.com 2012-08-20T09:39:23+00:00 697d5c004e390102efbf9320a5416873679bea81 When IORESOURCE_IRQ_SHAREABLE is set, the irq handler may be called even if the interupt of the USB module doesn't happen. So, it may clear the interrupt flags by mistake. This patch fixes it. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
When IORESOURCE_IRQ_SHAREABLE is set, the irq handler may be called
even if the interupt of the USB module doesn't happen. So, it may
clear the interrupt flags by mistake. This patch fixes it.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
renesas_usbhs: cleanup quoted includes 2012-06-05T08:15:25+00:00 Paul Bolle pebolle@tiscali.nl 2012-06-03T16:39:13+00:00 cc502bb741e1797290381da14dddb695ec1adbaf A few quoted includes start with a superfluous "./". Clean up those quoted includes. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz> 
A few quoted includes start with a superfluous "./". Clean up those
quoted includes.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
usb: renesas_usbhs: add IRQ resource decoding for IRQF_SHARED 2012-01-24T09:32:56+00:00 Shimoda, Yoshihiro yoshihiro.shimoda.uh@renesas.com 2012-01-05T06:37:18+00:00 53069af3fa8ba2849cd4785160690873995d4f39 In case of the SH7757, the irq number of USB module and SUDMAC are the same. So, we have to set the IRQF_SHARED in such a case. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com> 
In case of the SH7757, the irq number of USB module and SUDMAC
are the same. So, we have to set the IRQF_SHARED in such a case.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>